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  【第七章】 迭代器模式
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  <h2 id="迭代器模式"><a href="#迭代器模式" class="headerlink" title="迭代器模式"></a>迭代器模式</h2><blockquote>
<p>提供一种 “顺序访问” 一个聚合对象中的各个元素，而又不需要暴露该对象的内部表示。<br>迭代模式可以把迭代的过程从业务逻辑中分离出来，在使用迭代器模式之后，即使不关心对象的内部构造，也可以按顺序方位其中的每个元素。</p>
</blockquote>
<p>自己实现一个迭代器：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> each = <span class="function"><span class="keyword">function</span>(<span class="params">ary,callback</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">for</span>(<span class="keyword">var</span> i=<span class="number">0</span>;i&lt;ary.length;i++)&#123;</span><br><span class="line">        callback.call(<span class="literal">null</span>,i,ary[i])   <span class="comment">// 把下标和元素当作参数传给callback函数</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line">each([<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>],<span class="function"><span class="keyword">function</span>(<span class="params">i,n</span>)</span>&#123;</span><br><span class="line">    <span class="built_in">console</span>.log([i,n])</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<h2 id="内部迭代器"><a href="#内部迭代器" class="headerlink" title="内部迭代器"></a>内部迭代器</h2><blockquote>
<p>上面编写的 each 函数属于内部迭代器，each 函数的内部已经定义好了迭代规则，它完全接手整个迭代过程，外部只需要一次初始调用。  </p>
</blockquote>
<p>内部迭代器在调用的时候非常方便，外界不用关心迭代器内部的实现，跟迭代器的交互也仅仅是一次初始调用，但这也刚好是内部迭代器的缺点。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 内部迭代器实现 比较两个数组</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">compare</span>(<span class="params">ary1,ary2</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">if</span>(ary1.length != ary2.length)&#123;</span><br><span class="line">        <span class="built_in">console</span>.log(<span class="string">&#x27;不相等&#x27;</span>)</span><br><span class="line">        <span class="keyword">return</span></span><br><span class="line">    &#125;</span><br><span class="line">    each(ary1,<span class="function"><span class="keyword">function</span>(<span class="params">i,n</span>)</span>&#123;</span><br><span class="line">        <span class="keyword">if</span>(ary2[i]!=n)&#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">Error</span>(<span class="string">&#x27;不相等&#x27;</span>) <span class="comment">// console.log(&#x27;不相等&#x27;)</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;)</span><br><span class="line">    <span class="built_in">console</span>.log(<span class="string">&#x27;相等&#x27;</span>)</span><br><span class="line">&#125;</span><br><span class="line">compare([<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>],[<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>]) <span class="comment">// 相等</span></span><br></pre></td></tr></table></figure>

<h2 id="外部迭代器"><a href="#外部迭代器" class="headerlink" title="外部迭代器"></a>外部迭代器</h2><blockquote>
<p>外部迭代器必须显式地请求迭代下一个元素。<br>外部迭代器增加了一些调用的复杂度，但相对也增强了迭代器的灵活性，我们可以手工控制迭代的过程或者顺序。</p>
</blockquote>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> Iterator = <span class="function"><span class="keyword">function</span>(<span class="params">obj</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">var</span> current = <span class="number">0</span></span><br><span class="line">    <span class="keyword">var</span> next = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        current +=<span class="number">1</span>     </span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">var</span> isDone = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span> current &gt;= obj.length</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">var</span> getCurrentItem = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span> obj[current]</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> &#123;</span><br><span class="line">        next: next,</span><br><span class="line">        isDone: isDone,</span><br><span class="line">        getCurrentItem: getCurrentItem</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 外部迭代器实现 比较两个数组</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">compare</span>(<span class="params">Iterator1,Iterator2</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">while</span>(!Iterator1.isDone()&amp;&amp;!Iterator2.isDone())&#123;</span><br><span class="line">        <span class="keyword">if</span>(Iterator1.getCurrentItem() !== Iterator2.getCurrentItem())&#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">Error</span>(<span class="string">&#x27;不相等&#x27;</span>)</span><br><span class="line">        &#125;</span><br><span class="line">        Iterator1.next()</span><br><span class="line">        Iterator2.next()</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="built_in">console</span>.log(<span class="string">&#x27;相等&#x27;</span>)</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">var</span> Iterator1 = Iterator([<span class="number">4</span>,<span class="number">5</span>,<span class="number">6</span>])</span><br><span class="line"><span class="keyword">var</span> Iterator2 = Iterator([<span class="number">4</span>,<span class="number">5</span>,<span class="number">6</span>])</span><br><span class="line">compare(Iterator1,Iterator2)   <span class="comment">// 相等</span></span><br></pre></td></tr></table></figure>

<h2 id="迭代类数组对象和字面量对象"><a href="#迭代类数组对象和字面量对象" class="headerlink" title="迭代类数组对象和字面量对象"></a>迭代类数组对象和字面量对象</h2><blockquote>
<p>类数组：arguments<br>字面量对象：{‘0’:’a’,’1’:’b’}</p>
</blockquote>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">each</span>(<span class="params">obj,callback</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">var</span> value,</span><br><span class="line">    i=<span class="number">0</span>,</span><br><span class="line">    length = obj.length,</span><br><span class="line">    isArray = isArraylike(obj); <span class="comment">//假装封装好了一个判断是否是类数组的方法</span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span>(isArray)&#123;    <span class="comment">// 迭代类数组</span></span><br><span class="line">        <span class="keyword">for</span>(;i&lt;length;i++)&#123;</span><br><span class="line">            value = callback.call(<span class="literal">null</span>,i,obj[i])</span><br><span class="line">            <span class="keyword">if</span>(value === <span class="literal">false</span>)&#123;</span><br><span class="line">                <span class="keyword">break</span>;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">        <span class="keyword">for</span>(i <span class="keyword">in</span> obj)&#123;</span><br><span class="line">            value = callback.call(<span class="literal">null</span>,i,obj[i])</span><br><span class="line">            <span class="keyword">if</span>(value === <span class="literal">false</span>)&#123;</span><br><span class="line">                <span class="keyword">break</span>;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> obj</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="中止迭代器"><a href="#中止迭代器" class="headerlink" title="中止迭代器"></a>中止迭代器</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> each = <span class="function"><span class="keyword">function</span>(<span class="params">ary,callback</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">for</span>(<span class="keyword">var</span> i=<span class="number">0</span>;i&lt;ary.length;i++)&#123;</span><br><span class="line">        <span class="keyword">if</span>(callback(i,ary[i]) === <span class="literal">false</span>)&#123;</span><br><span class="line">            <span class="keyword">break</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line">each([<span class="number">11</span>,<span class="number">21</span>,<span class="number">31</span>,<span class="number">41</span>,<span class="number">51</span>],<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">    <span class="keyword">if</span>(n&gt;<span class="number">30</span>)&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">false</span></span><br><span class="line">    &#125;</span><br><span class="line">    <span class="built_in">console</span>.log(n)</span><br><span class="line">&#125;) <span class="comment">// 11 21</span></span><br></pre></td></tr></table></figure> 
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        document.querySelector('.sidebar').classList.remove('on');
      }
    </script>
    <div id="mask"></div>

<!-- #reward -->
<div id="reward">
  <span class="close"><i class="ri-close-line"></i></span>
  <p class="reward-p"><i class="ri-cup-line"></i>请我喝杯咖啡吧~</p>
  <div class="reward-box">
    
    <div class="reward-item">
      <img class="reward-img" src="https://cdn.jsdelivr.net/gh/Shen-Yu/cdn/img/alipay.jpg">
      <span class="reward-type">支付宝</span>
    </div>
    
    
    <div class="reward-item">
      <img class="reward-img" src="https://cdn.jsdelivr.net/gh/Shen-Yu/cdn/img/wechat.jpg">
      <span class="reward-type">微信</span>
    </div>
    
  </div>
</div>
    
<script src="/js/jquery-2.0.3.min.js"></script>


<script src="/js/lazyload.min.js"></script>

<!-- Tocbot -->


<script src="/js/tocbot.min.js"></script>

<script>
  tocbot.init({
    tocSelector: '.tocbot',
    contentSelector: '.article-entry',
    headingSelector: 'h1, h2, h3, h4, h5, h6',
    hasInnerContainers: true,
    scrollSmooth: true,
    scrollContainer: 'main',
    positionFixedSelector: '.tocbot',
    positionFixedClass: 'is-position-fixed',
    fixedSidebarOffset: 'auto'
  });
</script>

<script src="https://cdn.jsdelivr.net/npm/jquery-modal@0.9.2/jquery.modal.min.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/jquery-modal@0.9.2/jquery.modal.min.css">
<script src="https://cdn.jsdelivr.net/npm/justifiedGallery@3.7.0/dist/js/jquery.justifiedGallery.min.js"></script>

<script src="/dist/main.js"></script>

<!-- ImageViewer -->

<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

    <!-- Background of PhotoSwipe. 
         It's a separate element as animating opacity is faster than rgba(). -->
    <div class="pswp__bg"></div>

    <!-- Slides wrapper with overflow:hidden. -->
    <div class="pswp__scroll-wrap">

        <!-- Container that holds slides. 
            PhotoSwipe keeps only 3 of them in the DOM to save memory.
            Don't modify these 3 pswp__item elements, data is added later on. -->
        <div class="pswp__container">
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>

        <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
        <div class="pswp__ui pswp__ui--hidden">

            <div class="pswp__top-bar">

                <!--  Controls are self-explanatory. Order can be changed. -->

                <div class="pswp__counter"></div>

                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>

                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                        <div class="pswp__preloader__cut">
                            <div class="pswp__preloader__donut"></div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div>
            </div>

            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>

            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

    </div>

</div>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/default-skin/default-skin.min.css">
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe-ui-default.min.js"></script>

<script>
    function viewer_init() {
        let pswpElement = document.querySelectorAll('.pswp')[0];
        let $imgArr = document.querySelectorAll(('.article-entry img:not(.reward-img)'))

        $imgArr.forEach(($em, i) => {
            $em.onclick = () => {
                // slider展开状态
                // todo: 这样不好，后面改成状态
                if (document.querySelector('.left-col.show')) return
                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
                    let src = $em2.getAttribute('data-target') || $em2.getAttribute('src')
                    let title = $em2.getAttribute('alt')
                    // 获得原图尺寸
                    const image = new Image()
                    image.src = src
                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
                    index: parseInt(i)
                });
                gallery.init()
            }
        })
    }
    viewer_init()
</script>

<!-- MathJax -->

<!-- Katex -->

<!-- busuanzi  -->


<script src="/js/busuanzi-2.3.pure.min.js"></script>


<!-- ClickLove -->

<!-- ClickBoom1 -->

<!-- ClickBoom2 -->


<script src="/js/clickBoom2.js"></script>


<!-- CodeCopy -->


<link rel="stylesheet" href="/css/clipboard.css">

<script src="https://cdn.jsdelivr.net/npm/clipboard@2/dist/clipboard.min.js"></script>
<script>
  function wait(callback, seconds) {
    var timelag = null;
    timelag = window.setTimeout(callback, seconds);
  }
  !function (e, t, a) {
    var initCopyCode = function(){
      var copyHtml = '';
      copyHtml += '<button class="btn-copy" data-clipboard-snippet="">';
      copyHtml += '<i class="ri-file-copy-2-line"></i><span>COPY</span>';
      copyHtml += '</button>';
      $(".highlight .code pre").before(copyHtml);
      $(".article pre code").before(copyHtml);
      var clipboard = new ClipboardJS('.btn-copy', {
        target: function(trigger) {
          return trigger.nextElementSibling;
        }
      });
      clipboard.on('success', function(e) {
        let $btn = $(e.trigger);
        $btn.addClass('copied');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-checkbox-circle-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPIED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-checkbox-circle-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
      clipboard.on('error', function(e) {
        e.clearSelection();
        let $btn = $(e.trigger);
        $btn.addClass('copy-failed');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-time-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPY FAILED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-time-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
    }
    initCopyCode();
  }(window, document);
</script>


<!-- CanvasBackground -->


<script src="/js/dz.js"></script>



    
  </div>
</body>

</html>